Definitely sounds like a driver problem. Generally, when you first start the printer, it will print out a welcome page. Bad driver = bad printout. The printer might keep doing it until a good test page is printed.

If you're sharing this printer on a network, remove share properties. Another system may be configured to print w/ a generic driver (I've had the same problem at my company before).

The 5P is a bit long in the tooth theese days! is it a "Salvaged" from work printer?? if so you might want to consider swappping out the printer cable, older "bitronics" leads can cause problems like this (are you seeing lots of little smiley faces and playing card symbols??)

If after reinstalling the drivers and swapping the cable, it still dont work

Pop the sides open and make sure theres no SIMM memory fitted in there, if there is remove it and try again.

Make sure your parrallel port is set to either ECP or EPP in your BIOS settings

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